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WO2009092309A1 - Procédé et appareil de commande destinés à quantifier une fuite de bruit - Google Patents

Procédé et appareil de commande destinés à quantifier une fuite de bruit Download PDF

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Publication number
WO2009092309A1
WO2009092309A1 PCT/CN2009/070074 CN2009070074W WO2009092309A1 WO 2009092309 A1 WO2009092309 A1 WO 2009092309A1 CN 2009070074 W CN2009070074 W CN 2009070074W WO 2009092309 A1 WO2009092309 A1 WO 2009092309A1
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Prior art keywords
signal
transient signal
transient
time domain
decoding
Prior art date
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Ceased
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PCT/CN2009/070074
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English (en)
Chinese (zh)
Inventor
Deming Zhang
Qi Zhang
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2009092309A1 publication Critical patent/WO2009092309A1/fr
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes
    • G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/022—Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
    • G10L19/025—Detection of transients or attacks for time/frequency resolution switching

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a quantization noise leakage control method and apparatus.
  • the transform domain coding based on MDCT Mode Discrete Cosine Transform
  • MDCT Modified Discrete Cosine Transform
  • the core idea is to transform a signal of a certain length into a transform domain by some transformation, and then quantize the coefficients of the transform domain according to a specific quantization strategy. Since there is a masking effect in the human ear, this feature can be utilized when considering the quantization strategy, and a large quantization error is allowed when the signal energy is large.
  • Window length switching technology is a typical algorithm for solving quantization noise leakage caused by pre-echo based on MDCT transform algorithm, in MPEG (Moving Picture This technology is used in the Experts Group, Motion Picture Experts Group, PAC (Programmable Automation Controller), and ATARC (Adaptive Transform Acoustic Coding).
  • MPEG Motion Picture Experts Group
  • PAC Motion Picture Experts Group
  • ATARC Adaptive Transform Acoustic Coding
  • a longer analysis window is used when the signal is relatively stable, and a shorter analysis window is used when the signal suddenly appears transient.
  • the masking effect makes the leakage noise have no effect on the hearing; secondly, using a shorter analysis window can limit the number of bits required for the transient signal to the shortest time range.
  • the prior art 1 has at least the following disadvantages:
  • the perceptual model and the lossless coding part in the encoder need to support multiple time resolutions. Secondly, when using a shorter analysis window, the frequency domain resolution will be low and the coding efficiency will be reduced. And the switching of the analysis window itself will bring more delay to the encoder. The calculation process of perceptual entropy is very complicated, and there are many misjudgments, which will lead to erroneous window switching.
  • a signal is a pulse in the time domain, it is a predictable periodic signal in the frequency domain, and a larger coding gain can be obtained by LPC (Linear Prediction Coding) in the frequency domain.
  • TNS Temporal Noise Shaping
  • the residual signal after the LPC analysis is coded based on the perceptual coding principle, and the LPC analysis obtains the synthesis filter coefficient as the side signal for transmission; otherwise, it is considered that no transient signal is detected and is encoded according to the normal state.
  • the prior art 2 has at least the following disadvantages:
  • the prior art method for solving the problem of quantization noise caused by pre-echo in the time domain leakage problem has the following problems: high computational complexity, large delay, low coding efficiency, occupation of system resources, and accuracy.
  • Embodiments of the present invention provide a quantization noise leakage control method and apparatus, which have low delay, low complexity, high efficiency and the like.
  • An embodiment of the present invention provides an encoding apparatus, including: a transient signal detecting unit and a selection control unit; the transient signal detecting unit is configured to perform transient analysis on a currently input frame signal to detect whether a transient signal is present. And transmitting a transient signal detection result;
  • the selection control unit is configured to receive the transient signal detection result, and perform different coding methods for different signals.
  • An embodiment of the present invention provides a decoding apparatus, including: a transform decoding unit, configured to decode the received code stream to obtain an inverse transformed signal;
  • a transient signal flag detecting unit configured to detect a transient signal flag bit, determine whether a transient signal exists in the current frame signal according to the transient signal flag bit, and send the detection result;
  • the selection control unit is connected to the transform decoding unit and the transient signal flag detecting unit for receiving the detection result of the transient signal flag detecting unit, and selecting different manners for decoding different detection results.
  • Embodiments of the present invention provide a quantization noise leakage control method, including:
  • Embodiments of the present invention provide a quantization noise leakage control method, including:
  • the decoding process is performed by selecting a corresponding manner according to the judgment result.
  • the transient analysis of the input signal is based on each input frame, that is, the analysis of the fixed frame length signal, without considering different analysis frame lengths.
  • the problem of switching and convergence is solved, so the problem of time extension is solved;
  • the algorithm for transient analysis of the input signal is a low-complexity algorithm, only some comparison operations are needed, the calculation amount is quite small, and since only the detection is instantaneous
  • the time domain envelope of the signal is encoded and transmitted, which improves the coding efficiency and saves system resources.
  • the transient signal can be detected according to the transient signal flag, thereby performing a decoding process different from the non-transient signal, and the operation is simple, and the decoding accuracy is ensured.
  • Figure la is a schematic diagram of a prior art uncoded signal
  • Figure lb is a schematic diagram of a signal after transform coding in the prior art
  • FIG. 2 is a schematic diagram of an encoding apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a transient signal detecting unit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a decoding apparatus according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of an operation method of an encoding method according to Embodiment 2 of the present invention.
  • FIG. 6 is a flowchart of operations of a decoding method according to Embodiment 2 of the present invention.
  • the current frame signal is detected at the encoding end, and the detected transient signal and the non-transient signal are respectively subjected to different encoding processing, and the transient signal is normalized by using the time domain envelope, and then performed.
  • the transform coding based on the perceptual coding principle directly performs transform coding based on the perceptual coding principle for the non-transient signal, and then transmits all the encoded content and the transient signal detection result.
  • Transient signal flag detection is performed at the decoding end, and different decoding processes are performed on the transient signal and the non-transient signal.
  • a transient time signal is decoded to obtain a set of time domain envelopes, and the inversely transformed signal is decoded and utilized.
  • the decoded time domain envelope shapes the inverse transformed signal to obtain a final decoded signal.
  • the non-transient signal the inverse transformed signal is not processed to obtain a final decoded signal.
  • an embodiment of the present invention provides an encoding apparatus, as shown in FIG. 2, including: a transient signal detecting unit, a selecting control unit, a transient signal encoding processing unit, a transform coding unit, and an encoding register. . among them,
  • the transient signal detecting unit is configured to perform transient analysis on a frame signal of the current input, detect whether a transient signal occurs, and send the detection result;
  • the transient signal detecting unit may further include:
  • the maximum value calculation sub-unit is configured to divide a frame signal into a plurality of sub-frames, and calculate a maximum amplitude value of each sub-frame;
  • the transient detection function calculates a sub-unit, and calculates a maximum amplitude value of each sub-frame adjacent to the sub-frame The ratio of the sum of the maximum amplitude values of the first few subframes, to obtain a transient detection function;
  • a detecting subunit configured to determine whether the ratio is greater than a certain threshold, if the ratio is greater than a certain threshold, it is considered that a transient signal is detected, otherwise it is considered that no transient signal is detected;
  • the transient analysis process may be: first dividing a frame signal into a plurality of subframes, calculating a maximum amplitude value of each subframe, and using a maximum amplitude value of each subframe and a maximum amplitude of the first few subframes adjacent to the subframe.
  • the ratio of the sum of the values is used as a transient detection function. If the ratio is greater than a certain threshold, it is considered that a sudden change of the signal occurs, that is, a transient signal appears; otherwise, no transient signal is detected.
  • the number of adjacent sub-frames of the selected subframe is not limited as long as the validity of the transient detection function is ensured.
  • a selection control unit configured to receive the detection result, and select different manners for encoding different signals
  • the transient signal encoding processing unit is connected to the selection control unit, and is configured to obtain a set of time domain envelopes of the current transient signal, and normalize the transient signal; and a structural embodiment may further include:
  • a time domain envelope acquisition subunit connected to the selection control unit, for acquiring a set of current transient signals Domain envelope
  • a normalization processing sub-unit configured to perform normalization processing on the transient signal by using the acquired time domain envelope
  • encoding a sub-unit configured to perform encoding processing on the acquired time domain envelope
  • a transform coding unit coupled to the selection control unit and the transient signal encoding processing unit, for transforming and encoding the non-transient signal or the normalized transient signal;
  • the coding register is connected to the transform coding unit, the transient signal coding processing unit and the transient signal detection unit, and is configured to save and transmit the coding result of the coding end and the transient signal detection result.
  • the transient signal detection result indicates whether the signal is a transient signal, and can be implemented by setting a transient signal flag bit. For example, the flag bit can be set to
  • a time of 1 indicates that there is a transient signal, and a value of 0 indicates that there is no non-transient signal.
  • the encoded result includes the transformed encoded transient signal and the encoded time domain envelope, or the transform encoded non-transient signal.
  • the first embodiment of the present invention further provides a decoding apparatus, as shown in FIG. 4, including: a transient signal flag bit detecting unit, a selection control unit, a transform decoding unit, a transient signal processing unit, and Decode the register. among them,
  • the transient signal flag detecting unit is configured to detect a transient signal flag bit, determine whether a transient signal exists in the current frame signal according to the transient signal flag bit, and send the detection result.
  • a selection control unit connected to the transform decoding unit and the transient signal flag detecting unit, configured to receive the detection result of the transient signal flag detecting unit, and select different manners for decoding different detection results; a unit, configured to decode the received code stream to obtain an inverse transformed signal;
  • the transient signal processing unit is connected to the selection control unit and the transform decoding unit, and is configured to perform decoding processing on the received inverse-transformed transient signal.
  • the structural embodiment may further include:
  • a time domain envelope decoding subunit connected to the selection control unit, for decoding a time domain envelope in the encoded code stream to obtain a set of time domain envelopes
  • the transient signal shaping sub-unit is configured to perform shaping of the inverse transformed signal obtained by transform decoding by using the decoded time domain envelope to obtain a final decoded signal.
  • the decode register is coupled to the time domain envelope decoding subunit in the transient signal processing unit for storing the decoded time domain envelope.
  • the encoding apparatus and the decoding apparatus according to the first embodiment of the present invention solve the problems of high computational complexity, large delay, low coding efficiency, large occupied system resources, and low accuracy in the current quantization noise leakage control scheme.
  • a second embodiment of the present invention provides a quantization noise leakage control method, which includes a coding operation and a decoding operation.
  • the flowchart of the coding operation of the method according to the embodiment includes the following steps:
  • Step 51 Perform transient analysis on the current frame input signal to determine whether the current signal has a transient signal;
  • the transient analysis process may be: first dividing a frame signal into a plurality of subframes, calculating a maximum amplitude value of each subframe, and using a maximum amplitude value of each subframe and a maximum amplitude of the first few subframes adjacent to the subframe.
  • the ratio of the sum of the values is used as a transient detection function. If the ratio is greater than a certain threshold, it is considered that a sudden change of the signal occurs, that is, a transient signal appears; otherwise, no transient signal is detected.
  • the number of adjacent sub-frames of the selected subframe is not limited as long as the validity of the transient detection function is ensured.
  • the transient signal flag is set to a specific value. For example, the transient signal flag is set to 1 for the transient signal and 0 for the non-transient signal.
  • Step 52 If a transient signal occurs, calculate a set of time domain envelopes of the frame signal;
  • the maximum amplitude value of each subframe is quantized, and the quantized value is a set of time domain envelopes.
  • the method of extracting the time domain envelope may not be unique.
  • the logarithmic energy value of each subframe may also be calculated and quantized as a time domain envelope.
  • the time domain envelope is encoded, and the encoding timing of the time domain envelope is not limited.
  • the sending has been performed. Any time before the encoded content, for example, may be before or after the input signal is subjected to transform coding based on the perceptual coding principle.
  • Step 53 Normalize the frame signal by using the calculated time domain envelope to remove the transient signal.
  • the normalization process is: dividing the signal of each subframe by the time domain packet corresponding to the subframe. Network, get the normalized signal.
  • Step 54 Perform transform coding based on the perceptual coding principle on the input signal
  • step 54 is directly performed, that is, the non-transient signal is subjected to transform coding based on the perceptual coding principle; if a transient signal is present, the normalized transient signal is subjected to perceptual sensing. Transform coding of coding principles;
  • Step 55 Send the transient signal detection result and all the encoded content
  • the detection result of the transient signal indicates whether it is a transient signal flag. For example, if it is a transient signal, the flag is 1, and if it is not a transient signal, the flag is 0.
  • the encoded content includes: a transform encoded transient signal and an encoded time domain envelope, or a transform encoded non-transient signal.
  • the flow of the decoding part described in the second embodiment of the present invention is as shown in FIG. 6, and includes the following processes:
  • Step 61 Perform transform decoding on the received code stream to obtain an inverse transformed signal.
  • Step 62 Decode the transient signal flag bit, and determine whether the current frame signal has a transient signal according to the transient signal flag bit;
  • the flag bit obtained after decoding it can be judged whether there is a transient signal currently, for example, if the flag bit is 1, it means There is a transient signal, and the process goes to step 63. If the flag bit is 0, it means that there is no transient signal, then the signal after the inverse transform is not processed, and the operation is ended, and finally the decoded signal is obtained;
  • the step 62 and the step 61 can be performed synchronously, and the two steps have no sequence sequence, that is, the received code stream is transformed and decoded while decoding the transient signal flag, but the transient is received before outputting the inverse transformed signal.
  • the signal flag detection result is determined according to the result, whether it is direct output or processing such as shaping.
  • Step 63 If there is a transient signal, the code stream is decoded to obtain a set of time domain envelopes;
  • the encoded code stream contains a time domain envelope, which is decoded to obtain a set of time domain envelopes;
  • Step 63 The inverse-transformed signal obtained by the decoding is shaped by using the time domain envelope obtained by the decoding to obtain a final decoded signal.
  • the shaping process includes: multiplying each inversely transformed sub-frame signal by The corresponding time domain envelope.
  • the transient analysis of the input signal is based on each input frame, that is, the analysis of the fixed frame length signal, without considering the switching and convergence problems caused by different analysis frame lengths. Therefore, the problem of large delay is solved; the algorithm for transient analysis of the input signal is a low-complexity algorithm, which only needs to perform some comparison operations, the calculation amount is quite small, and only because the transient signal is detected.
  • the time domain envelope of the signal is encoded and transmitted, and more bits can be used in the transform coding without transient peaks, which improves the quantization precision and coding efficiency, and saves system resources.
  • the transient signal can be detected according to the transient signal flag bit, thereby performing a decoding process different from the non-transient signal, and the operation is simple, and the decoding accuracy is ensured.
  • the method described in the second embodiment of the present invention is described in detail below by using a specific example.
  • the present example is applied to an ultra-wideband speech codec system. In this system, only transient decisions and transient signal flag bits need to be set, and no specific identification is needed. The time when the transient signal appears can be.
  • the MDCT-based transform coding technique is usually adopted for the 7 ⁇ 14KHz ultra-wideband portion.
  • the transient signal is A continuous large energy signal is not processed as a transient signal.
  • transient signal flag is set to 1; otherwise, it is considered that there is no transient signal, and 1 ⁇ is set to 0;
  • Quantify 4 ' to obtain b normalize the signal in the frame by using the inverse quantized time domain envelope. That is, the time domain envelope is first inverse quantized, and then smoothed, and the smoothed time is obtained.
  • the domain envelope 4 is then normalized using the smoothed time domain envelope, ie '; c, encoding 4
  • the transient analysis of the input signal is based on each input frame, that is, the analysis of the fixed frame long signal, the switching and convergence problems caused by different analysis frame lengths are not considered, and the solution is solved.
  • the problem of extended time; the algorithm for transient analysis of the input signal is a low-complexity algorithm, which only needs to perform some comparison operations, the calculation amount is quite small, and the signal is only due to the detection of the transient signal.
  • the time domain envelope is encoded and transmitted, and more bits can be used in transform coding without transient peaks, which improves quantization accuracy and coding efficiency, and saves system resources.
  • the transient signal can be detected according to the transient signal flag, so that the decoding process is different from the non-transient signal, and the operation is simple, and the decoding accuracy is ensured.
  • the readable storage medium is, for example, a read only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, or the like.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Quality & Reliability (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

L'invention concerne un appareil de commande destiné à quantifier une fuite de bruit. Cet appareil comprend: une unité de détection de signal transitoire (21) servant à diviser une trame de signal d'entrée de courant en plusieurs sous-trames, calculer la valeur d'amplitude maximale de chaque sous-trame, utiliser, comme fonction de détection de signal transitoire, un rapport: valeur d'amplitude maximale de chaque sous-trame/somme des valeurs d'amplitude maximale de plusieurs sous-trames adjacentes, évaluer ce rapport, si le rapport est supérieur à un seuil, alors le signal transitoire est considéré comme ayant été détecté, sinon le signal transitoire n'est pas considéré comme ayant été détecté, et transmettre le résultat de détection du signal transitoire; et une unité de commande de sélection (22) servant à recevoir le résultat de détection du signal transitoire et à sélectionner un mode différent pour coder un signal différent.
PCT/CN2009/070074 2008-01-16 2009-01-08 Procédé et appareil de commande destinés à quantifier une fuite de bruit Ceased WO2009092309A1 (fr)

Applications Claiming Priority (2)

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CN 200810056312 CN101488344B (zh) 2008-01-16 2008-01-16 一种量化噪声泄漏控制方法及装置
CN200810056312.9 2008-01-16

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CN102419977B (zh) * 2011-01-14 2013-10-02 展讯通信（上海）有限公司 瞬态音频信号的判别方法
RU2575993C2 (ru) 2011-02-14 2016-02-27 Фраунхофер-Гезелльшафт Цур Фердерунг Дер Ангевандтен Форшунг Е.Ф. Основанная на линейном предсказании схема кодирования, использующая формирование шума в спектральной области
SG192721A1 (en) 2011-02-14 2013-09-30 Fraunhofer Ges Forschung Apparatus and method for encoding and decoding an audio signal using an aligned look-ahead portion
KR101562281B1 (ko) 2011-02-14 2015-10-22 프라운호퍼 게젤샤프트 쭈르 푀르데룽 데어 안겐반텐 포르슝 에. 베. 트랜지언트 검출 및 품질 결과를 사용하여 일부분의 오디오 신호를 코딩하기 위한 장치 및 방법
CA2903681C (fr) 2011-02-14 2017-03-28 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Codec audio utilisant une synthese du bruit durant des phases inactives
MY166394A (en) 2011-02-14 2018-06-25 Fraunhofer Ges Forschung Information signal representation using lapped transform
CA2827156C (fr) 2011-02-14 2017-07-18 Tom Backstrom Codage et decodage des positions d'impulsion des pistes d'un signal audio
MY159444A (en) 2011-02-14 2017-01-13 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E V Encoding and decoding of pulse positions of tracks of an audio signal
MX2013009301A (es) 2011-02-14 2013-12-06 Fraunhofer Ges Forschung Aparato y metodo para ocultamiento de error en voz unificada con bajo retardo y codificacion de audio.
WO2012110415A1 (fr) 2011-02-14 2012-08-23 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Appareil et procédé permettant de traiter un signal audio décodé dans un domaine spectral

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